boot_loader: load intel microcode update data file

Change-Id: I323a57cc0b1f05ad7b60b6a141d068a3e618ee4d
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2263
Reviewed-by: Adrien Destugues <[email protected]>

headers/private/kernel/boot/arch/x86/arch_cpu.h

@@ -21,4 +21,9 @@ void calculate_cpu_conversion_factor(uint8 channel);
 }
 #endif
 
+#include <boot/vfs.h>
+
+void ucode_load(BootVolume& volume);
+
+
 #endif	/* BOOT_ARCH_CPU_H */

headers/private/kernel/boot/platform.h

@@ -43,6 +43,7 @@ extern void platform_switch_to_logo(void);
 extern void platform_switch_to_text_mode(void);
 extern void platform_start_kernel(void);
 extern void platform_exit(void);
+extern void platform_load_ucode(BootVolume& volume);
 
 #ifdef __cplusplus
 }

src/system/boot/arch/x86/cpu.cpp

@@ -17,6 +17,7 @@
 #include <boot/stdio.h>
 
 #include <arch/cpu.h>
+#include <arch/x86/arch_cpu.h>
 #include <arch_kernel.h>
 #include <arch_system_info.h>
 
@@ -311,6 +312,62 @@ slower_sample:
 	}
 }
 
+extern int open_maybe_packaged(BootVolume& volume, const char* path,
+	int openMode);
+
+void
+ucode_load(BootVolume& volume)
+{
+	cpuid_info info;
+	if (get_current_cpuid(&info, 0, 0) != B_OK
+		|| strncmp(info.eax_0.vendor_id, "GenuineIntel", 12) != 0)
+		return;
+
+	if (get_current_cpuid(&info, 1, 0) != B_OK)
+		return;
+
+	char path[128];
+	int family = info.eax_1.family;
+	int model = info.eax_1.model;
+	if (family == 0x6 || family == 0xf) {
+		family += info.eax_1.extended_family;
+		model += (info.eax_1.extended_model << 4);
+	}
+	snprintf(path, sizeof(path), "system/data/firmware/intel-ucode/"
+		"%02x-%02x-%02x", family, model, info.eax_1.stepping);
+	dprintf("ucode_load: %s\n", path);
+
+	int fd = open_maybe_packaged(volume, path, O_RDONLY);
+	if (fd < B_OK) {
+		dprintf("ucode_load: couldn't find microcode\n");
+		return;
+	}
+	struct stat stat;
+	if (fstat(fd, &stat) < 0) {
+		dprintf("ucode_load: couldn't stat microcode file\n");
+		close(fd);
+		return;
+	}
+
+	ssize_t length = stat.st_size;
+	const uint32 alignment = 16;
+#define ALIGN(size, align)	(((size) + align - 1) & ~(align - 1))
+	void *buffer = kernel_args_malloc(length + alignment - 1);
+	if (buffer != NULL) {
+		buffer = (void*)ALIGN((addr_t)buffer, alignment);
+		if (read(fd, buffer, length) != length) {
+			dprintf("ucode_load: couldn't read microcode file\n");
+			kernel_args_free(buffer);
+		} else {
+			gKernelArgs.ucode_data = buffer;
+			gKernelArgs.ucode_data_size = length;
+			dprintf("ucode_load: microcode file read in memory\n");
+		}
+	}
+
+	close(fd);
+}
+
 
 extern "C" bigtime_t
 system_time()

src/system/boot/loader/loader.cpp

@@ -55,7 +55,7 @@ static const char *sAddonPaths[] = {
 };
 
 
-static int
+int
 open_maybe_packaged(BootVolume& volume, const char* path, int openMode)
 {
 	if (strncmp(path, kSystemDirectoryPrefix, strlen(kSystemDirectoryPrefix))

src/system/boot/loader/main.cpp

@@ -128,6 +128,7 @@ main(stage2_args *args)
 
 			gKernelArgs.ucode_data = NULL;
 			gKernelArgs.ucode_data_size = 0;
+			platform_load_ucode(bootVolume);
 
 			// apply boot settings
 			apply_boot_settings();

src/system/boot/platform/bios_ia32/cpu.cpp

@@ -70,3 +70,10 @@ cpu_init()
 	gKernelArgs.num_cpus = 1;
 		// this will eventually be corrected later on
 }
+
+
+extern "C" void
+platform_load_ucode(BootVolume& volume)
+{
+	ucode_load(volume);
+}

src/system/boot/platform/bios_ia32/long.cpp

@@ -244,6 +244,7 @@ convert_kernel_args()
 	fix_address(gKernelArgs.debug_output);
 	fix_address(gKernelArgs.previous_debug_output);
 	fix_address(gKernelArgs.boot_splash);
+	fix_address(gKernelArgs.ucode_data);
 	fix_address(gKernelArgs.arch_args.apic);
 	fix_address(gKernelArgs.arch_args.hpet);
 

src/system/boot/platform/efi/cpu.cpp

@@ -16,3 +16,10 @@ cpu_init()
 	gKernelArgs.num_cpus = 1;
 		// this will eventually be corrected later on
 }
+
+
+extern "C" void
+platform_load_ucode(BootVolume& volume)
+{
+	ucode_load(volume);
+}

src/system/boot/platform/efi/start.cpp

@@ -90,6 +90,7 @@ convert_kernel_args()
 	fix_address(gKernelArgs.debug_output);
 	fix_address(gKernelArgs.boot_splash);
 	#if defined(__x86_64__) || defined(__x86__)
+	fix_address(gKernelArgs.ucode_data);
 	fix_address(gKernelArgs.arch_args.apic);
 	fix_address(gKernelArgs.arch_args.hpet);
 	#endif